droid4 hdmi on 4.14-rc4+

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Hi,

I have been trying to get HDMI to work on the Motorola Droid4, as I saw
that it should be supported. When I enable DRM_OMAP, OMAP4_DSS_HDMI and
DRM_OMAP_CONNECTOR_HDMI, I don't get any output on HDMI (Full config
here [1], for Linux 4.14-rc4). I see this in dmesg (repeatedly) [2]:

[   21.360321] of_get_named_gpiod_flags: parsed 'hpd-gpios' property of
node '/connector[0]' - status (0)
[   21.370147] connector-hdmi connector: failed to find video source

My hunch is that perhaps something is missing in the device tree, but
after looking for time in the omapdrm code I cannot figure it out. Am I
perhaps missing some configuration options?

I also do not seem to have any /dev/dri entries, although I did expect
to see them.

Regards,
Merlijn

[1] http://sprunge.us/GIhC
[2] http://sprunge.us/bXWf

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